How can I encrypt a querystring in asp.net?

Question

I need to encrypt and decrypt a querystring in ASP.NET.

The querystring might look something like this:

http://www.mysite.com/report.aspx?id=

Answer 1

I was originally going to agree with Joseph Bui on the grounds that it would be more processor efficient to use the POST method instead, web standards dictate that if the request is not changing data on the server, the GET method should be used.

It will be much more code to encrypt the data than to just use POST.